/*      $OpenBSD: arc4random_uniform.c,v 1.2 2015/09/13 08:31:47 guenther Exp $ */

/*
 * Copyright (c) 2008, Damien Miller <djm@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */


/****************************************************************************
 * Included Files
 ****************************************************************************/
#ifndef __INCLUDE_STDLIB_H
#define __INCLUDE_STDLIB_H
/****************************************************************************
 * Included Files
 ****************************************************************************/

#include "stdlib.h"
#include "los_sys.h"
#include "hisoc/timer.h"

uint32_t arc4random_uniform(uint32_t upper_bound)
{
    uint32_t r, min;

    if (upper_bound < 2)
        return 0;

    /* 2**32 % x == (2**32 - x) % x */
    min = -upper_bound % upper_bound; /*lint !e501*/
    /*
     * This could theoretically loop forever but each retry has
     * p > 0.5 (worst case, usually far better) of selecting a
     * number inside the range we need, so it should rarely need
     * to re-roll.
     */
    for (;;) {
        r = arc4random();
        if (r >= min)
            break;
    }
    return r % upper_bound;
}

/****************************************************************************
 * Function:  abs labs llabs
 ****************************************************************************/
int abs(int j)
{
    if (j < 0)
    {
        j = -j;
    }
    return j;
}

long labs(long j)
{
    if (j < 0)
    {
        j = -j;
    }
    return j;
}

//#ifdef CONFIG_HAVE_LONG_LONG
long long int llabs(long long int j)
{
  if (j < 0)
    {
      j = -j;
    }
  return j;
}
//#endif

#endif /* __INCLUDE_STDLIB_H */

